Nu7 implementation #298

Job	Run time
Bitrot check	1m 13s
Build target wasm32-wasi	33s
Latest build on ubuntu-latest	32s
Check ZFuture build on Linux	55s
Latest build on windows-latest	2m 22s
Clippy (MSRV)	57s
Check ZFuture build on macOS	1m 29s
Latest build on macOS-latest	38s
Clippy (beta)	14s
Check ZFuture build on Windows	2m 36s
Code coverage	6m 39s
Intra-doc links	1m 14s
protobuf consistency	48s
Rustfmt	12s
UUID validity	3s
Test on Linux	6m 7s
Test Orchard on Linux	6m 5s
Test NU6 on Linux	6m 5s
Test on macOS	5m 47s
Test Orchard on macOS	6m 4s
Test on Windows	5m 52s
Test Orchard on Windows	5m 52s
Test NU6 on Windows	5m 53s
	1h 8m 10s

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